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A064028 as a simple table

na(n)
11
23
312
436
5216
61020
78160
861920
9507744
104383392
1152600704
12624249600
138739494400
14109190390400
151583122968000
1625318378008000
17455730804144000
188193040840252800
19163860816805056000
203256371347261760000
2167204676251838361600
221366492477414792734720

[1,3,12,36,216,1020,8160,61920,507744,4383392,
 52600704,624249600,8739494400,109190390400,
 1583122968000,25318378008000,455730804144000,
 8193040840252800,163860816805056000,
 3256371347261760000,67204676251838361600,
 1366492477414792734720]